63640885 has 32 divisors (see below), whose sum is σ = 99366912. Its totient is φ = 37942080.

The previous prime is 63640879. The next prime is 63640891. The reversal of 63640885 is 58804636.

It is an interprime number because it is at equal distance from previous prime (63640879) and next prime (63640891).

It is not a de Polignac number, because 63640885 - 2⁹ = 63640373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5262 + ... + 12448.

It is an arithmetic number, because the mean of its divisors is an integer number (3105216).

Almost surely, 2^63640885 is an apocalyptic number.

It is an amenable number.

63640885 is a deficient number, since it is larger than the sum of its proper divisors (35726027).

63640885 is a wasteful number, since it uses less digits than its factorization.

63640885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7233.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 63640885 is about 7977.5237386046. The cubic root of 63640885 is about 399.2504400270.

The spelling of 63640885 in words is "sixty-three million, six hundred forty thousand, eight hundred eighty-five".